JPS60212746A - Camera finder device - Google Patents

Abstract

PURPOSE:To recognize a peripheral scene, too, of an image obtained by a zoom lens, and to select a suitable shot by combining and displaying both an image taken in by the zoom lens, and an image taken in from a light intake window, which is not zoomed, and displaying a frame for showing a field of view of the zoom lens as for the image which is not zoomed. CONSTITUTION:An optical image of an object to be photographed passes through a zoom lens 2, reaches an image pickup tube 6 through a half mirror 8, and on the other hand, reaches a finder 5 through these half mirrors 8, 9, and an image magnified by the zoom lens 2 is displayed on the upper half 21 of this finder 5. On the othr hand, an optical image taken in from a light intake window 3 passes through a half mirror 10. Subsequently, the image having the same center as the image taken in by the zoom lens 2, and also of a range corresponding to a field of view of a light intake window 2 is displayed on the lower half 22 of the finder 5. In such a way, a user of this camera can observe together an image obtained by the zoom lens 2, and its peripheral image or scene by seeing two parts 21, 22 of the finder 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a finder device for a television camera or an eight-point camera.

BACKGROUND OF THE INVENTION Conventionally, the field of view visible through the viewfinder of a camera equipped with a zoom lens is limited to the field of view of the zoom lens.

Specifically, the higher the magnification of a zoom lens, the narrower the field of view reflected in the viewfinder becomes, and there is a problem in that it is impossible to recognize the '+hR around the area to be photographed just by looking at the viewfinder.

For example, in a 1R-eye reflex camera, the frame to be photographed and the viewfinder frame remain constant even when the lens is changed, so the zoomed object screen and its surroundings cannot be observed. In addition, with the double-image matching type 11i viewfinder with distance meter, it is possible to change the frame display of the field of view by inserting a frame into the optical path and replace the lens, but the size of the frame depends on the zoom ratio of the zoom lens. It cannot be changed automatically.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a finder which, when a zoom lens is used, can display an image of the field of view enlarged by the zoom lens together with the surrounding scene.

composition Examples of the present invention will be described below with reference to the drawings.

In Fig. 1, 1 is a camera body, and this camera is a normal film camera, a television camera, 8
An optional camera such as a camera. 2 is the camera body 1
A zoom lens is detachably attached to the front of the camera body 1, and 3 is a lighting window provided in the front of the camera body 1, and the center of the subject of the image entering from the zoom lens 2 and the center of the image entering from the lighting window 3 are aligned. It is arranged so that 4 is a zoom ratio detector which will be described in detail later.

An optical finder 5 is provided on the rear surface of the camera body 1 so that the image obtained from the zoom lens 2 and the image obtained from the lighting window 3 can be viewed visually.

A photographing mechanism (not shown) similar to that of a normal camera is also provided within the camera body 1.

FIG. 2 shows a block diagram of the main parts of the camera shown in FIG. 1, where 6 is a film in the case of a normal camera and an image pickup tube in the case of a television camera.

Reference numeral 7 denotes a contrast device that creates an optical image of a frame 20 as shown in FIG. 3, for example, indicating the size of the field of view seen through the zoom lens 2. The imager 7 is configured such that a signal indicating the zoom ratio of the zoom lens 2 is applied from the zoom ratio detector 4 to the imager 7.
, D2 are changed.

In the camera with the above configuration, the optical image of the object to be photographed passes through the zoom lens 2, and the S-7 mirror 8
On the other hand, it passes through half mirrors 8 and 9 and reaches the finder 5, and the upper half 21 of this finder 5 has an image magnified by the zoom lens 2, as shown in FIG. The image is displayed.

On the other hand, the light image taken in from the lighting window 3 passes through the bar 7 mirror 10. In the lower half 22 of the finder 5, an image having the same center as the image captured by the zoom lens 2 and covering a wide range corresponding to the field of view of the lighting window 2 is displayed.

On the other hand, a signal representing the zoom ratio of the zoom lens 2 is applied from the zoom ratio detector 4 to the imager 7, and the imager 7 detects a frame 20 representing the field of view corresponding to the currently set zoom ratio of the zoom lens 2. An image is created and projected onto a finder 5 via a half mirror 10, and a frame 2 () is projected on the lower half 22 of the 7-eye ring 5.

Therefore, the user of this camera can adjust the zoom lens 2 by looking at the two parts 21 and 22 of the viewfinder 5.
It is possible to observe both the image obtained by the camera and the surrounding image or scene.

Note that when the zoom ratio of the zoom lens 2 is changed, the size of the frame 20 also changes corresponding to the zoom ratio.

FIG. 4 shows an X embodiment in which the present invention is applied to a television camera, etc., and the same parts as in FIGS. 1 and 2 are given the same reference numerals.

11 is an image pickup tube that converts the image captured by the zoom lens 2 into an electric signal in the same manner as in a television camera; 12 is an electronic viewfinder using a CRT picture tube that operates as a finder; and 13 is an output image of the image pickup tube 11. A processing circuit for electronic viewing 7 converts the signal into a standard NTSC format television video signal to be displayed on the picture tube 12, and 1.1 is an imaging circuit that converts the image captured by the lighting window 2 into an electrical signal. The tube 15 converts the output signal of the image pickup tube 14 into a standard N'rS
This is a processing circuit for an electronic viewfinder that converts a C-format television signal.

The output of the processing circuit 15 is applied to a mixing circuit 16 and also to a synchronization separation circuit 18 to extract a synchronization signal from the standard television video signal, and this synchronization signal is applied to an imager 17. The contrast device 17 is placed in the frame 20 shown in Figure 13.
A video signal for displaying on the electronic viewfinder 12 is output. The synchronization signal is used to create a video signal for displaying the frame as described above.

A video signal representing the frame 20 created by the imager 17 is applied to the mixing circuit 16.

In the above-mentioned apparatus, an image captured from the zoom lens 2 is converted into an NTSC format video signal by the image pickup tube 11 and the electronic view 7 viewing processing circuit 13, and is applied to the electronic viewfinder 12. The image captured by the zoom lens 2 is displayed on the electronic viewing screen 7 in the same manner as the upper half of FIG.

On the other hand, the image captured through the lighting window 3 is also converted into an NTSC format video signal by the image pickup tube 14 and the electronic viewfinder processing circuit 15, and is applied to the mixing circuit 16. On the other hand, a video signal corresponding to a frame 20 having a size corresponding to the visual field of the lens 2 is applied from the contrast device 17 to the mixing circuit 16 . Then, the video signal of the image taken in from the lighting window 3 and the video signal representing the frame 20 are combined,
It is applied to the electronic view 7 wing 12.

As a result, an image is displayed in the lower half 22 of the electronic viewfinder 12, in which the image captured through the lighting window 3 is superimposed on the image of the frame 20 representing the field of view of the zoom lens 2 (i).

The embodiment shown in FIG. 5 converts the image captured by the zoom lens 2 into a television signal and displays it on the electronic viewfinder 12.
The image captured through the lighting window 3 is optically processed and displayed together with the frame 20 of the optical finder 5. In this case, as shown in FIG. 6, the electronic viewfinder 1 and the optical finder 5 are provided side by side on the rear surface of the camera body 1.

The zoom ratio detector 4 and the imager 7 are constructed as shown in FIG. 7 as mechanical and optical types used in the embodiment of FIG. 2. First, the zoom ratio detector 4 has a pinion 31 meshed with a gear 30 provided around the zoom lens 2, and the rotational force of the pinion 31 is transmitted through a gear mechanism 32 to gears 33 and 34. It is.

In addition, the relic device 7 has a pair of vertically reciprocating iso-yoko 40a,
40b and horizontal reciprocating movement 8! l structure 42a.

42b, these moving mechanisms 40a, 4011, 4
2a.

horizontal frame string 35a driven by 42b;
3Sb and the frame circumference string 36a in the vertical direction.

36b, each string 35a, 35b, 3
A frame 20 is formed by 6a and 36b.

Vertical reciprocating mechanisms 40a and 4 (Jb are rotatable roller pairs 50.51 and annular strings 40a wound around each roller pair 50.51, respectively).

4t, lb, two parallel frame strings 35a
.

:(5b is stretched across the annular strings 40a and 40b as shown in the figure. Horizontal reciprocating mechanism 42a
, 42b are rotatable roller pairs,')3.54
and an annular string 4 wound around each pair of rollers 53 and 54.
3a, 43b, and two frame strings 36a,
36b is stretched between annular strings 43a and 43b.

Roller 5 (1, 51 is connected to gear 33 via gear 55, 56)
．． 34, and the rollers 53, 54 are driven by gears 57.
58 and driven by gears 33,34.

With the above configuration, when the zoom lens 2 is rotated and moved back and forth in order to change the zoom ratio of the zoom lens 2,
Gears 33 and 34 rotate due to the rotation of the binion 31,
The rollers 55 to 58 rotate to rotate the annular string 4.
1a, 41b, 43a.

, 131J, the respective frame circumference strings 3Sa, 35b move toward or away from each other in the vertical direction, while by moving the annular strings 43a, 43b, the frame circumference strings 3G+1, 3C1l
+ moves toward or away from each other in the horizontal direction, and the frame 20 expands or contracts. This frame 20 is projected onto the finder.

FIGS. 8 and 9 show a zoom ratio detector and an imager using an electric circuit and a liquid crystal display element.

In FIG. 8, a resistor 60 extending in the circumferential direction is installed on the outer periphery of the zoom lens 2, and a fixed terminal 61 fixed to one end of the resistor 60 is connected to an A/D converter (analog/digital converter).
The brush 63 connected to one input terminal of the digital converter) 62 and in sliding contact with the resistor 60 is connected to the A/I) converter 6.
The Ikekata end of 2 is connected to 1-1. Then, as the zoom lens 2 rotates, the open resistance value I between the fixed terminal 61 and the brush 63 changes, and the A/I) converter 62 outputs a resistance value R and an analog voltage corresponding to this resistance value R. Convert to dinotal signal.

The image recording device 17 includes, for example, a liquid crystal display 71 in which a plurality of [shape segments] 70 are arranged diagonally at each corner of a rectangle, and a driving circuit 72 thereof.

Each segment 70-1.70-2. ... 70-n is led out to the outside by the lead conductor 73.

In FIG. 9, reference numeral 74 denotes a counter electrode arranged to face each segment 70.

The drive circuit 72 includes an A/D converter 62 as shown in FIG.
comparator 64-1.64-2. . . . transistors 72-1, 72-2, . . . 72-n, each transistor 72-1, 72-2 . . . . 72-n's flaper is connected to each segment 70-1, 7 (1-2, . . . 70-n
connected to. A transistor 75-1.75-2... is connected to the base of each transistor 70-1.70-2.
It is connected so that it is turned on when the output of the comparator in the lower stage is 1.

In FIG. 9, a plurality of "shaped segments are shown only in the upper left corner, but a plurality of [segments 70-2, 70-3...70-] are also shown in the other three corners, respectively. Provide n.

Although FIG. 10 shows a drive circuit for only one corner segment 7( ), a drive circuit with a similar configuration is provided for each corner segment.

Each comparator 64-1.64-2°...6 of the A/D converter
411 has a voltage divider 65-1.65-2. ...65-n
Different voltages are applied to each of the resistors 60 and 60.
According to the resistance value R, the output of one of the comparators becomes 1.
It is configured so that

With the above configuration, when the zoom ratio of the zoom lens 2 is changed, the resistance value R changes, and for example, when the voltage applied to the child terminal of the comparator 64-1 exceeds the voltage of the voltage divider 65-1, -1 output becomes 1, transistor 7
2-1 is turned off, a voltage is applied to segment) 70-1, this segment) 70-1 enters the display state, and the widest frame is displayed.

Similarly, when the resistance value R changes in response to a change in the zoom ratio of the zoom lens 2, the voltage applied to the comparator also changes, and the output of a comparator, for example 64-2, having a reference voltage corresponding to that voltage. becomes 1, the transistor corresponding to it is turned off, the segment 72-2 enters the display state, and the size of the frame 20 changes in accordance with the zoom ratio. At this time, the output of the comparator G4-2 turns on the transistor 75-1 and turns on the transistor 72-1, so that the segment 72-1 is not displayed. The above-mentioned displayed frame is projected onto the finder.

FIG. 11 shows a detailed embodiment of the mixing circuit 16.

t'7 obtained from electronic viewfinder process 15
A video signal representing the body is amplified by a transistor 80, passes through an analog date 81, and is applied to the base of a transistor 82.

On the other hand, the image capture circuit 17 outputs, for example, a constant value (a value representing the white level of the television screen), and this output voltage is applied to the transistor 83. Transistor 82 through analog date 84
applied to the base of Analog switches 84 and 81 respectively output a date signal GATE and its inverted signal GAT.
E is applied, and in the case of GATE power bow, the image representing the subject (Mu) is applied to the transistor 82 through the analog switch 81, and the electronic view 7 Aing 1
2, the subject image is displayed. On the other hand, electronic view 7
At the timing corresponding to the frame 20 on the screen of the wing 12, the signals C and ATE become 0. I\TE is 1 in the signal
As a result, a white level signal is applied to the transistor 82, and a white frame 20 appears in the electronic viewfinder 12.
is displayed. In each of the above-described embodiments, the arrangement of the zoom lens image and the image captured through the lighting window on the finder can be arbitrarily selected.

Effects of the Invention As detailed above, this invention displays an image taken with a zoom lens and an unzoomed image taken through a lighting window, and a frame representing the field of view of the zoom lens is displayed on the unzoomed image. The user can now recognize the surrounding scene of the image obtained with the zoom lens, and can select an appropriate shot when shooting with the zoom lens.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a camera system equipped with a finder of the present invention, FIG. 2 is a block diagram showing an embodiment of the system shown in FIG. 1, and FIG. 3 is a 7-finger view of the camera shown in FIG. 4 and 5 are block diagrams showing other embodiments. FIG. 6 is a perspective view showing an example of the camera system of the embodiment shown in FIG. FIG. 7 is a diagram showing a detailed example of an optical zoom ratio detector and a contrast device, FIG. 8 is a block diagram showing an example of an electrical zoom ratio detector and a contrast device, and FIG. FIG. 10 is a circuit diagram showing details of the contrast device shown in FIGS. 8 and 9, and FIG. 11 is a circuit diagram showing an example of a mixing circuit6]... ... Camera body, 2 ... Zoom lens, 3 ... Lighting window, 4 ... Zoom ratio detector, 5 ... Finder, 6 ... ...Image tube 7...Contrast device, 8.9.10...Half mirror-1 11...Image tube, 12...Electronic view finder, 13...Electronic view Finder processing circuit,]
4... Image pickup tube, 15... Electronic viewfinder processing circuit, 1
6... Mixing circuit, 17... Contrast device. Patent applicant: Lif Co., Ltd. Agent: Patent attorney (foreign) 1 person overseas Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] (1) A lighting window that takes in a light image of a desired field of view, a zoom lens, a contrast means that creates a frame image representing the outer periphery of the field of view of the zoom lens, and a light image taken in from the lighting window. a first finder that superimposes and displays a frame image obtained by the means; and a second finder that displays an image of the field of view of the zoom lens.
A camera finder device characterized by having an eyeing.